blower unit and compressor, below $40 per unit for general
cleaning
usually can negotiate if you do more units.
chemical wash is another story.
I service my own blower units by dismantling the outer plastic
cover till I can access the fans, use a hard brush to remove the
accumulated dirt at the fan.
If you have a wet vacuum cleaner you should clear the water outlet
too. I use an old dry vacuum, remove the dust bag and suck the
water outlet. Do this periodically (say once every 3 months if you
use the AC regularly).
For now, pay for the service and watch the uncle clean the aircon,
noting what he removes. Will save you tons of money and time.
.... the compressor unit is another matter. Outside the window, I
won't attempt to do any maintenance other than removing the dirt
stuck at the louvres. The AC guy recommends a long water hose and
spray DOWNwards at the louvres during rainy weather. I found that
my son's super soakers work just as well.
